java实现在普通类中注入service或mapper

  @Autowired
  private UserService userService;

   private static UserService users;

  @PostConstruct
  public void init() {
      users= userService;
  }

 users.selectUser(user);

@SpringBootApplication
@Enableswagger2
@EnableSwaggerBootstrapUI
@EnableFeignClients(basePackages = {"XXXX.XXXX.api"})
@ComponentScan(value = {"XXXXX.XXXX.api.config", "com.XXXX.gateway.XXX", "com.XXXXX.XXXX.auth"})
@MapperScan("com.XXXX.XXXX.XXX.mapper")
@EnableScheduling
public class IotGateWayParkServiceApplication {
    public static void main(String[] args) {
        springApplication.run(IotGateWayParkServiceApplication.class);
    }
}

public class impl{
 @Autowired
 private XxxMapper mapper;
}

@Mapper
@Respository
public interfaceXxxMapper{
 
}

    @Autowired
    private IotGatewayParkInfoService service;